Mio Alpha Heart-Rate Monitor (Gear of the Year 2013)

No more pesky chest straps! The USB-rechargeable Alpha has a sensor to detect heart rate at your wrist. It fits comfortably without feeling bulky. With two easy buttons, program in your heart-rate zones and benefit from visual and audio alerts on the run. Because it works continuously as you go, you can get by-the-moment feedback on your level of exertion, with what Mio promises is a 99% accuracy rate. It's also Bluetooth-compatible, so you can hook it up to your compatible smartphone and use in conjunction with apps like Strava, MapMyRun, Endomondo, miCoach, RunKeeper and others.